Legacy 650 is a longer-range version of the Legacy 600 giving it a range capability of 7,223 km.
The selection gives a boost to the US engine firm, which lost out to rival manufacturer CFM International for IndiGo's 280 aircraft engine order in June.
Engine snag forces IndiGo to ground 7 new aircraft
Vistara has six Airbus A320s in a three class configuration.
The airline has failed to address fliers' fears and has been opaque about the allegations of tax and financial fraud, giving rise to apprehension that Jet Airways may be headed the Kingfisher way.
Naresh Goyal, after being ousted with his wife from the board last week, and with his shareholding halved to 25 per cent, can still make a comeback by partnering a new investor and win back majority control.
Volumes are up over 20 per cent y-o-y in January-April.
The airline will fly the A320s between the Tier-II and Tier-III cities.
The 16-hour flight will be the first direct one from India to the US west coast.
Govt's decision to allow in-flight Wi-Fi doesn't take off with budget airlines, full-service carriers enthused
Sale of wide-body aircraft will not affect internatinal flights, says Jet
'The airline business is very dynamic. If you are unable to keep up and lead, you end up last.' 'This is what has happened to Jet.'
Vistara is likely to offer 148 seats in a three-class configuration in its Airbus A320s, industry sources said.
Jet's advertising and that of most other airlines has been limited to new routes or promotional fares.
For international travel, frequent flyers look at network and Air India's global network is weak.
The airline pitches its product and service, keeps silent about price in a new campaign as it looks to win over young business travelers.
Life of air passengers was different in the 1970s.
Ninety years later, BA counts the country as its second-biggest overseas market after the US.